In his first-ever interview, the sole Australian survivor of the Waco siege has revealed to 60 Minutes what really took place during the 51-day stand-off, and why he believes crazed cult leader David Koresh will one day return to Earth as the son of God.

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The government was working on a suite of measures ahead of the budget tackling the range of housing issues, from homelessness to releasing more land.

Asked whether he was being sidelined from economic matters in favour of Malcolm Turnbull, he said the prime minister was the "chief economic spokesperson for the government".

"This is the norm in Australian politics and he is the chief when it comes to all matters of the government," Mr Morrison said.

He said the biggest economic challenge was flat wage growth, which would flow through to lower government revenues and household consumption.

Opposition Leader Bill Shorten said Malcolm Turnbull continued to ignore the elephant in the room when it came to housing policy - negative gearing and capital gains tax concessions.

"If he would adopt reforms to negative gearing, there would be two wins," Mr Shorten told reporters in Melbourne.

"It would improve the bottom line of the budget and secure our triple A rating and it also means that young Australians and their parents have a level-playing field when they go to auctions on a Saturday and are not competing unfairly against people subsidised to buy their rental property through a taxpayer-funded concession."